A highly realistic smartphone selfie-style image of a young American woman standing in front of a bathroom mirror with an embarrassed expression. She slightly opens her mouth showing naturally yellow stained teeth. One hand touches her cheek while she looks frustrated and insecure. Warm cozy bathroom lighting. Realistic American bathroom background with sink clutter and skincare products. Natural TikTok UGC composition, slight handheld feeling, authentic atmosphere. On-screen feeling: yellow teeth insecurity, coffee stains, embarrassed smile. 9:16 vertical image.